US20110265549A1 - Methods and apparatus for calibrating flow controllers in substrate processing systems - Google Patents
Methods and apparatus for calibrating flow controllers in substrate processing systems Download PDFInfo
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- US20110265549A1 US20110265549A1 US12/915,345 US91534510A US2011265549A1 US 20110265549 A1 US20110265549 A1 US 20110265549A1 US 91534510 A US91534510 A US 91534510A US 2011265549 A1 US2011265549 A1 US 2011265549A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67253—Process monitoring, e.g. flow or thickness monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/87153—Plural noncommunicating flow paths
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/87571—Multiple inlet with single outlet
- Y10T137/87676—With flow control
- Y10T137/87684—Valve in each inlet
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/877—With flow control means for branched passages
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/53—Means to assemble or disassemble
- Y10T29/53022—Means to assemble or disassemble with means to test work or product
Definitions
- Embodiments of the present invention generally relate to substrate processing equipment.
- an inner volume of a process chamber may be exposed to one or more process gases.
- process gases are provided at desired flow rates controlled by one or more flow controllers that provide the process gases to the inner volume.
- the inventors have discovered that no methods exist for confirming that the process gases from the shared gas panel are being split correctly to each chamber by the flow controllers.
- the inventors have observed that there typically are not any on-tool apparatus available on a multi-chamber substrate processing system, such as a cluster tool, for monitoring the flow controllers of each chamber, for example, to detect drift or to compare drift between flow controllers on different chambers of the system.
- the inventors have provided methods and apparatus for calibrating a plurality of flow controllers in substrate processing systems.
- a substrate processing system may include a cluster tool comprising a first process chamber and a second process chamber coupled to a central vacuum transfer chamber; a first flow controller to provide a process gas to the first process chamber; a second flow controller to provide the process gas to the second process chamber; a mass flow verifier to verify a flow rate from each of the first and second flow controllers; a first conduit to selectively couple the first flow controller to the mass flow verifier; and a second conduit to selectively couple the second flow controller to the mass flow verifier.
- a substrate processing system may include a first flow controller to provide a process gas to a first zone of a first process chamber; a second flow controller to provide the process gas to a second zone of the second process chamber; a mass flow verifier to verify a flow rate from each of the first and second flow controllers; a first conduit to selectively couple the first flow controller to the mass flow verifier; and a second conduit to selectively couple the second flow controller to the mass flow verifier.
- a method for calibrating a plurality of flow controllers in a substrate processing system comprising a first process chamber and a second process chamber coupled to a central vacuum transfer chamber
- the method may include providing a first gas at a first flow rate from a first flow controller coupled to a first process chamber; diverting the first gas to a mass flow verifier via a first conduit; determining the first flow rate using the mass flow verifier; providing a second gas at a second flow rate from a second flow controller coupled to a second process chamber; diverting the second gas to the mass flow verifier via a second conduit; and determining the second flow rate using the mass flow verifier.
- a method for calibrating a plurality of flow controllers in a substrate processing system may include providing a first gas to a mass flow verifier by a first flow controller coupled to a first zone of a first process chamber; determining a first flow rate of the first gas using the mass flow verifier; providing a second gas to the mass flow verifier by a second flow controller coupled to a second zone of the first process chamber; and determining a second flow rate of the second gas using the mass flow verifier, wherein the first flow controller is capable of providing the first gas to the first zone while the second flow controller is providing the second gas to the mass flow verifier.
- FIGS. 1-1A depict a schematic top view of a multi-chamber substrate processing system in accordance with some embodiments of the present invention.
- FIG. 2 depicts a flow chart of a method for calibrating a plurality of flow controllers in a substrate processing system in accordance with some embodiments of the present invention.
- FIG. 3 depicts a flow chart of a method for calibrating a plurality of flow controllers in a substrate processing system in accordance with some embodiments of the present invention.
- inventive methods and apparatus for calibrating a plurality of flow controllers in a substrate processing system are disclosed herein.
- the inventive methods and apparatus advantageously facilitate measuring one or more flow rates provided by one or more flow controllers in direct comparison to both a reference standard (e.g., a mass flow verifier) and to other flow controllers coupled to one or more process chambers in various configurations.
- the inventive systems and methods thus may advantageously provide decreased time required to calibrate each of the flow controllers and improved uniformity between the flow controller measurements, thereby facilitating improved chamber matching (e.g., improved uniformity of process results between two different chambers operating under similar process conditions).
- a cluster tool, or multi-chamber processing system 100 may generally comprise a factory interface 102 , a vacuum-tight processing platform 104 , and a system controller 144 .
- a processing system that may be suitably modified in accordance with the teachings provided herein include the Centura® integrated processing system, one of the PRODUCER® line of processing systems (such as the PRODUCER® GTTM), ADVANTEDGETM processing systems, or other suitable processing systems commercially available from Applied Materials, Inc., located in Santa Clara, California. It is contemplated that other processing systems (including those from other manufacturers) may be adapted to benefit from the invention.
- twin chamber processing system One example of a twin chamber processing system that may be modified to incorporate the present invention in accordance with the teachings herein is described in United States Provisional Patent Application Ser. No. 61/330,156, filed Apr. 30, 2010, by Ming Xu, et al., and entitled, “Twin Chamber Processing System.”
- the platform 104 may include a plurality of processing chambers (six shown) 110 , 111 , 112 , 132 , 128 , 120 and at least one load-lock chamber (two shown) 122 that are coupled to a transfer chamber 136 .
- Each process chamber includes a slit valve or other selectively sealable opening to selectively fluidly couple the respective inner volumes of the process chambers to the inner volume of the transfer chamber 136 .
- each load lock chamber 122 includes a port 125 to selectively fluidly couple the respective inner volumes of the load lock chambers 122 to the inner volume of the transfer chamber 136 .
- the factory interface 102 is coupled to the transfer chamber 136 via the load lock chambers 122 .
- the processing chambers 110 , 111 , 112 , 132 , 128 , 120 may be grouped in pairs with each of the processing chambers 110 and 111 , 112 and 132 , and 128 and 120 in each pair positioned adjacent to one another.
- each pair of process chambers may be part of a twin chamber processing system ( 101 , 103 , 105 ) where each respective pair of process chambers may be provided in a common housing with certain shared resources provided, as discussed herein.
- Each twin chamber processing system 101 , 103 , 105 may include a pair of independent processing volumes that may be isolated from each other.
- each twin chamber processing system may include a first process chamber and a second process chamber, having respective first and second processing volumes.
- the first and second processing volumes may be isolated from each other to facilitate substantially independent processing of substrates in each respective process chamber.
- the isolated processing volumes of the process chambers within the twin chamber processing system advantageously reduces or eliminates processing problems that may arise due to multi-substrate processing systems where the processing volumes are fluidly coupled during processing.
- the twin chamber processing system further advantageously utilizes shared resources that facilitate reduced system footprint, hardware expense, utilities usage and cost, maintenance, and the like, while at the same time promoting higher substrate throughput.
- the process chambers may be configured such that processing resources 146 A, 146 B, 146 C (collectively 146 ) (i.e., process gas supply, power supply, vacuum pumping systems or the like) may be respectively shared between each of the processing chambers 110 and 111 , 112 and 132 , and 128 and 120 , and/or within each pair of processing chamber in each twin processing system 101 , 103 , 105 .
- shared hardware and/or resources may include one or more of a process foreline and roughing pump, AC distribution and DC power supplies, cooling water distribution, chillers, multi-channel thermo controllers, gas panels, controllers, and the like.
- the factory interface 102 includes at least one docking station 108 and at least one factory interface robot (two shown) 114 to facilitate transfer of substrates.
- the docking station 108 is configured to accept one or more (two shown) front opening unified pods (FOUPs) 106 A-B.
- the factory interface robot 114 generally comprises a blade 116 disposed on one end of the robot 114 configured to transfer the substrates from the factory interface 102 to the processing platform 104 for processing through the load lock chambers 122 .
- one or more metrology stations 118 may be connected to a terminal 126 of the factory interface 102 to facilitate measurement of the substrates from the FOUPs 106 A-B.
- each of the load lock chambers 122 may include a first port 123 coupled to the factory interface 102 and a second port 125 coupled to the transfer chamber 136 .
- the load lock chambers 122 may be coupled to a pressure control system which pumps down and vents the load lock chambers 122 to facilitate passing the substrates between the vacuum environment of the transfer chamber 136 and the substantially ambient (e.g., atmospheric) environment of the factory interface 102 .
- the transfer chamber 136 has a vacuum robot 130 disposed therein.
- the vacuum robot 130 generally comprises one or more transfer blades (two shown) 134 coupled to a movable arm 131 .
- the vacuum robot 130 may have two parallel transfer blades 134 configured such that the vacuum robot 130 may simultaneously transfer two substrates 124 , 126 from the load lock chambers 122 to each pair of processing chambers (e.g., 110 and 111 , 112 and 132 , and 120 and 128 ).
- the processing chambers 110 , 111 , 112 , 132 , 120 , 128 may be any type of process chamber utilized in substrate processing. However, to utilize the shared resources, each pair of processing chambers is the same type of chamber, such as an etch chamber, a deposition chamber, or the like.
- suitable etch chambers include any of the Decoupled Plasma Source (DPS) line of chambers, a HARTTM, E-MAX®, or ENABLER® etch chamber available from Applied Materials, Inc., of Santa Clara, Calif. Other etch chambers, including those from other manufacturers, may be utilized.
- Each pair of process chambers 110 and 111 , 112 and 132 , and 120 and 128 may have shared resources 146 A, 146 B, or 146 C.
- the shared resources may include a shared gas panel (for example, as illustrated in FIG. 1 for shared resources 146 B, 146 C) for providing a process gas as discussed below.
- the shared resources may include a shared vacuum pump for pumping down each process chamber in combination with an adjacent chamber or individually.
- each process chamber may include an individual vacuum pump (not shown) for pumping down an inner volume of each process chamber.
- the shared resources include a shared gas panel between process chambers.
- the shared resource 146 B includes a shared gas panel 150 that is shared between the process chamber 112 and the process chamber 132 as illustrated in FIG. 1 .
- the shared gas panel 150 may, for example, include a plurality of process gas sources that are coupled to the process chambers 112 , 132 via a plurality of flow controllers and associated apparatus.
- the term flow controllers refers to any apparatus for controlling the rate of flow of a gas or gases flowing through the flow controller, such as mass flow controllers, flow ratio control devices, flow control orifices, or the like.
- each gas source of the shared gas panel 150 may be coupled to a mass flow controller that meters the gas from the gas source at a desired flow rate.
- a first process gas from a first process gas source (not shown) of the gas panel 150 may be metered through a flow controller 152 and a second process gas from a second gas source (not shown) of the shared gas panel 150 may be metered through a flow controller 154 .
- the first and second process gases may exit the flow controllers 152 , 154 and enter a mixer 156 which may be coupled to respective outlets of each flow controller 152 , 154 .
- the first and second process gases may be mixed, or homogenized, in the mixer 156 in a ratio relative to the respective amounts of each process gas metered out by the flow controllers 152 , 154 .
- the mixed first and second process gases may be distributed to the process chambers 112 , 132 via a multi-channel flow ratio controller or another similar apparatus that can control the gas respectively provided to each process chamber, and, optionally, to two or more zones within a given process chamber.
- a multi-channel flow ratio controller 158 may include a shared inlet 160 for receiving the mixed first and second processes gases from the outlet of the mixer and may distribute the mixed first and second process gases to the process chambers 112 , 132 via one or more flow controllers, such as mass flow controllers, flow ratio controllers, fixed orifices, or the like, or combinations thereof.
- two pairs of flow controllers 162 , 164 , 166 , 168 are shown with a first pair of flow controllers (e.g., 162 , 164 ) coupled to the process chamber 112 and a second pair of flow controllers (e.g., 166 , 168 ) coupled to the process chamber 132 .
- the multi-channel flow ratio controller 158 may include one or more flow controllers each providing the mixed first and second process gas to each process chamber 112 , 132 (two flow controllers coupled to each chamber depicted in FIG. 1 ).
- the flow controllers 162 , 164 provide the mixed first and second process gas to the process chamber 112 and the flow controllers 164 , 166 provide the mixed first and second process gas to the process chamber 132 .
- Each pair of flow controllers, for example flow controllers 162 , 164 may provide the mixed first and second process gas to each process chamber, for example the process chamber 112 , at different flow rates.
- the flow controller 162 may provide the mixed first and second process gas through a first inlet 170 of the process chamber 112 at a different rate than provided by the flow controller 164 through a second inlet 172 of the process chamber 112 .
- the first and second inlets 170 , 172 may be inner and outer zones of a showerhead (not shown), different zones of gas inlets, or the like.
- the multi-chamber substrate processing system 100 further includes a mass flow verifier 174 to verify a flow rate from each of the flow controllers discussed above and further any flow controller in need of flow rate verification in the system 100 .
- additional flow controllers may be part of the shared resource 146 A or the shared resource 146 C.
- the shared resources 146 A and 146 C may have a shared gas panel and flow controller configuration similar to that described above for shared resource 146 B.
- the mass flow verifier 174 may be any suitable apparatus for verifying the flow rate of a gas provided by a mass flow controller. Such mass flow verifiers may operate, for example, by monitoring the rate of rise of a pressure in a known volume over a period of time, or by some other suitable method for independently confirming the flow rate of any flow controller being monitored by the mass flow verifier 174 . In some embodiments, the mass flow verifier 174 may be mounted on one of the twin chamber processing systems 101 , 103 , 105 .
- the mass flow verifier 174 may be mounted on the transfer chamber 136 of the multi-chamber processing system 100 , or in some other suitable location for being coupled to each of the flow controllers coupled to each of the process chambers of the multi-chamber processing system 100 .
- the mass flow verifier 174 may be selectively coupled to each flow controller by individual conduits disposed below (e.g., downstream of) an outlet of the flow controller.
- each flow controller may be selectively coupled to the mass flow verifier via individual conduits, rather than by a single conduit coming from a manifold where the process gases are mixed together, the inventive apparatus facilitates independent verification and/or calibration of each flow controller without impacting the ability of the other flow controllers from providing process gases while verifying or calibrating the flow from one of the flow controllers.
- Each conduit may be respectively coupled to a given flow controller at a location downstream of the flow controller by a multi-way valve (not shown), or the like, that may selectively couple a respective flow controller to either the process chamber or the mass flow verifier 174 .
- a process gas that would normally flow from the outlet of a flow controller towards a process chamber may be diverted into the conduit by a multi-way valve to flow into the mass flow verifier 174 .
- the flow controller being verified does not provide a process gas to a process chamber, but all other flow controllers of the system 100 may continue to provide a process gas to a process chamber, for example to process a substrate or the like.
- flow may be bypassed around the mass flow verifier 174 so that the conduits can be quickly evacuated without having to flow through the mass flow verifier 174 , thereby speeding up gas switchover purging between different gas flows being verified.
- each flow controller of the process system 100 may have a conduit coupling the given flow controller to the mass flow verifier 174 .
- a conduit 176 couples the flow controller 152 to the mass flow verifier 174 .
- a similar conduit couples the flow controller 154 to the mass flow verifier 174 .
- conduits 178 , 180 couple the mass flow verifier 174 to respective flow controllers 162 , 166 , which may provide similar (or the same) gas flows to corresponding regions or zones in adjacent process chamber 112 , 132 .
- conduits may be coupled to multiple flow controllers which provide a process gas to the same chamber.
- the conduit 180 couples the flow controller 166 to the mass flow verifier 174 and a conduit 182 couples the flow controller 168 to the mass flow verifier 174 , where the flow controllers 166 , 168 provide a process gas to the process chamber 132 .
- all the conduits coupling the respective flow controllers of the system 100 to the mass flow verifier 174 may have substantially equivalent or about the same flow conductance. As used herein, substantially equivalent (or about the same) includes about +/ ⁇ 10 percent variation in conductance.
- the conduits coupling flow controllers providing process gases to corresponding regions in different process chambers may have substantially similar or about the same flow conductance.
- the conduits 178 , 180 which couple flow controllers 162 , 166 on adjacent process chambers 112 , 132 may have substantially similar or about the same flow conductance such that a comparison of a flow rate of each flow controller 162 , 166 may be made by the mass flow verifier 174 .
- the conduit 176 coupling the flow controller 152 to the mass flow verifier 174 and a conduit 184 coupling a flow controller 186 to the mass flow verifier may have substantially similar or about the same flow conductance.
- the flow controller 186 is a flow controller that provides the same process gas to the twin chamber processing system 103 as the flow controller 152 provides to the twin chamber processing system 105 .
- the mass flow verifier 174 may be configured for choked flow where, for example, a flow rate of a process gas entering the mass flow verifier 174 from a conduit is independent of the flow conductance in that conduit.
- the mass flow verifier 174 may further comprise a critical flow nozzle 188 disposed at an inlet of the mass flow verifier 174 such that the process gas flows through the critical flow nozzle when entering the mass flow verifier 174 .
- the critical flow nozzle 188 may be configured, for example based on inlet and outlet hole diameter, length, shape or the like, to normalize a flow rate of any gas which enters the critical flow nozzle 188 independent of the flow conductance in a conduit from which the gas originated.
- the critical flow nozzle may provide a restriction such that a pressure drop across the critical flow nozzle is provided that at least halves the pressure (e.g., a first pressure immediately upstream of the critical flow nozzle is at least two times greater than a second pressure immediately downstream of the critical flow nozzle).
- downstream conductance may be minimized to provide lower baseline pressures which enable higher flow rates to be used.
- the system controller 144 is coupled to the processing system 100 for controlling the processing system 100 or components thereof.
- the system controller 144 may control the operation of the system 100 using a direct control of the process chambers 110 , 111 , 112 , 132 , 128 , 120 of the system 100 or alternatively, by controlling the computers (or controllers) associated with the process chambers 110 , 111 , 112 , 132 , 128 , 120 and the system 100 .
- the system controller 144 enables data collection and feedback from the respective chambers and system controller 144 to optimize performance of the system 100 .
- the system controller 144 generally includes a central processing unit (CPU) 138 , a memory 140 , and support circuits 142 .
- the CPU 138 may be one of any form of a general purpose computer processor that can be used in an industrial setting.
- the memory, or computer-readable medium, 140 is accessible by the CPU 138 and may be one or more of readily available memory such as random access memory (RAM), read only memory (ROM), floppy disk, hard disk, or any other form of digital storage, local or remote.
- the support circuits 142 are conventionally coupled to the CPU 138 and may comprise cache, clock circuits, input/output subsystems, power supplies, and the like.
- inventive methods disclosed herein may generally be stored in the memory 140 (or in memory of a particular process chamber pair, as discussed below) as a software routine that, when executed by the CPU 138 , causes the pair of process chambers to perform processes in accordance with the present invention.
- FIG. 2 depicts a flow chart of a method 200 for calibrating a plurality of flow controllers in a substrate processing system in accordance with some embodiments of the present invention. The method 200 will be described below in accordance with the inventive apparatus described in FIG. 1 .
- a first gas may be provided by a first flow controller coupled to a first process chamber at a first flow rate to a mass flow verifier.
- the first flow controller may be any flow controller of the system 100 as described above, however, the method 200 will be described below with respect to the flow controllers 162 , 166 , and 168 of the twin chamber process system 105 .
- the first flow controller may be the flow controller 166 which may provide a first gas to the process chamber 132 under typical operating conditions; however, during flow verification the first gas is diverted as discussed above through the conduit 180 to the mass flow verifier 174 .
- the flow controller 166 provides the first gas to the process chamber via a first inlet 171 , where the first inlet 171 is substantially equivalent to the first inlet 170 as discussed above for process chamber 112 .
- the first flow rate of the flow controller 166 may be determine using the mass flow verifier 174 .
- the first flow rate may be determined using rate of rise in a pressure in a known volume or a similar verification method.
- the mass flow verifier 174 may be configured for choked flow or flow conductance of each conduit may be known or substantially similar.
- the flow controller 166 may be calibrating based on the determined first flow rate by the mass flow verifier 174 .
- the flow controller 166 may require calibration. For example, if the difference is less than about 1%, the flow controller 166 may be considered in condition for operation. If the difference is greater than about 5%, the flow controller 166 may require replacement.
- the mass flow verifier 174 may be cleared of the first gas after the first flow rate of the flow controller 166 is determined by the mass flow verifier 174 .
- the mass flow verifier 174 may be cleared of the first gas by diverting the first gas from the conduit 180 back to the process chamber 132 and/or turning off the flow controller 166 .
- the first gas may be removed via an outlet (not shown) of the mass flow verifier 174 by a vacuum pump or the like (not shown) coupled to or part of the system 100 .
- a second gas may be provided by a second flow controller coupled to a second process chamber at a second flow rate to the mass flow verifier 174 .
- the second flow controller may be the flow controller 162 which may provide the second gas to the process chamber 112 under typical operating conditions; however, during flow verification the second gas is diverted as discussed above through the conduit 178 to the mass flow verifier 174 .
- the second gas may be substantially equivalent to the first gas.
- the second flow rate may be substantially equivalent to the first flow rate.
- the flow controller 166 may be providing the first gas to the process chamber 132 .
- the flow controller 166 may be turned off.
- the flow controller 162 may have been any one of providing the first gas to the process chamber 112 or turned off while the flow controller 166 was being verified at 202 and 204 as described above.
- the second flow rate of the flow controller 162 may be determine using the mass flow verifier 174 .
- the second flow rate may be determined by any of the methods discussed above at 204 .
- the flow controller 162 may require calibration. For example, if the difference is less than about 1%, the flow controller 162 may be considered in condition for operation. If the difference is greater than about 5%, the flow controller 162 may require replacement.
- the method 200 may proceed to 302 (as shown in FIG. 3 ) where the first gas provided by a third flow controller to the first process chamber at a third flow rate may be provided to the mass flow verifier 174 .
- the third flow controller may be the flow controller 168 which provides the first gas to the process chamber 132 under typical operating conditions; however, during flow verification the first gas is diverted as discussed above through the conduit 182 to the mass flow verifier 174 .
- the flow controller 168 provides the first gas to the process chamber via a second inlet 173 , where the second inlet 173 is substantially equivalent to the second inlet 172 as discussed above for process chamber 112 .
- the method 200 may proceed to 302 after the first gas has been cleared from the mass flow verifier 174 at 206 .
- the method 200 may proceed to 302 after the second gas has been cleared from the mass flow verifier 174 (not illustrated in flow chart of method 200 in FIG. 2-3 ) after the flow controller 162 has been verified at 210 .
- the flow controllers 166 , 168 may be part of a multi-channel flow ratio controller 158 which includes a shared inlet 160 for receiving the first gas, which may for example be a mixture of process gases provided from the outlet of the mixer 156 , and may distribute the first gas (e.g., a singular gas or a mixture of gases) to the process chambers 112 , 132 via one or more flow controllers (and in this exemplary embodiment, to the process chamber 132 via the flow controllers 166 , 168 ).
- the flow controllers 166 , 168 may provide the first gas to the process chamber 132 at a desired flow rate ratio between the first and second inlets 171 , 173 .
- the desired flow rate ratio may be achieved, for example, by setting the first and third flow rates of the flow controllers 166 , 168 to desired flow rates.
- the flow rate of each flow controller can be independently verified by the mass flow verifier 174 . For example, as discussed above, the flow controller 166 has been verified at 204 .
- the third flow rate of the flow controller 168 may be determine using the mass flow verifier 174 .
- the third flow rate may be determined by any of the methods discussed above at 204 .
- the flow controller 168 may require calibration.
- either or both of the flow controllers 162 , 166 may be idled or providing a gas to one of the respective process chambers 112 , 132 while the flow controller 168 is being verified as discussed below.
- the second gas can be provided to the process chamber 112 via the flow controller 162 (and/or via the flow controller 164 ) to process a substrate (not shown) disposed in process chamber 112 while the flow controller 168 is being verified by the mass flow verifier 174 .
- the flow controller 166 may be idle or operating while the flow controller 168 is being verified by the mass flow verifier 174 .
- the flow rate ratio of the first gas being provided to the process chamber 132 via the first and second inlets 171 , 173 by the flow controllers 166 , 168 can be determined by comparing the determined first and third flow rates.
- the first and third flow controllers can be calibrated individually based on the determined flow rate ratio, or alternatively, the multi-channel flow ratio controller 158 may be calibrated as a whole based on the determined flow rate ratio.
- the mass flow verifier 174 may be cleared of the first gas after determination of the third flow rate for the flow controller 168 is completed.
- the mass flow verifier 174 may be cleared using any of the methods discussed above.
- the method 200 may, for example, proceed to step 208 or alternatively proceed to verify another flow controller, for example, such as flow controller 186 or other flow controllers associated with shared resource 146 C of twin chamber process system 103 .
- the method 200 may begin again, or be performed periodically, or after a desired number of process runs or the like to verify calibration of the flow controllers of the system 100 .
- the above teachings may also be used to modify a single process chamber having multiple zones in order to facilitate flow verification and calibration of multiple flow meters coupled to the various zones of the single process chamber.
- multiple process chambers that are proximately located may also be modified to share a mass flow verifier in accordance with the teachings provided herein.
- a twin chamber processing system e.g., 101
- inventive methods and apparatus for calibrating a plurality of flow controllers in a substrate processing system are disclosed herein.
- the inventive methods and apparatus advantageously facilitate measuring one or more flow rates provided by one or more flow controllers in direct comparison to both a reference standard (e.g., a mass flow verifier) and to other flow controllers coupled to one or more process chambers in various configurations.
- the inventive systems and methods thus may advantageously provide decreased time required to calibrate each of the flow controllers and improved uniformity between the flow controller measurements, thereby facilitating improved chamber matching (e.g., improved uniformity of process results between two different chambers operating under similar process conditions).
Abstract
Description
- This application claims benefit of U.S. provisional patent application Ser. No. 61/330,056, filed Apr. 30, 2010, which is herein incorporated by reference.
- Embodiments of the present invention generally relate to substrate processing equipment.
- During substrate processing, such as etching process, an inner volume of a process chamber may be exposed to one or more process gases. Often, such process gases are provided at desired flow rates controlled by one or more flow controllers that provide the process gases to the inner volume. In some process chamber configurations, for example where shared gas panels supply the process gases to multiple process chambers, the inventors have discovered that no methods exist for confirming that the process gases from the shared gas panel are being split correctly to each chamber by the flow controllers. In addition, the inventors have observed that there typically are not any on-tool apparatus available on a multi-chamber substrate processing system, such as a cluster tool, for monitoring the flow controllers of each chamber, for example, to detect drift or to compare drift between flow controllers on different chambers of the system.
- Accordingly, the inventors have provided methods and apparatus for calibrating a plurality of flow controllers in substrate processing systems.
- Methods and apparatus for calibrating a plurality of gas flows in a substrate processing system are provided herein. In some embodiments, a substrate processing system may include a cluster tool comprising a first process chamber and a second process chamber coupled to a central vacuum transfer chamber; a first flow controller to provide a process gas to the first process chamber; a second flow controller to provide the process gas to the second process chamber; a mass flow verifier to verify a flow rate from each of the first and second flow controllers; a first conduit to selectively couple the first flow controller to the mass flow verifier; and a second conduit to selectively couple the second flow controller to the mass flow verifier.
- In some embodiments, a substrate processing system may include a first flow controller to provide a process gas to a first zone of a first process chamber; a second flow controller to provide the process gas to a second zone of the second process chamber; a mass flow verifier to verify a flow rate from each of the first and second flow controllers; a first conduit to selectively couple the first flow controller to the mass flow verifier; and a second conduit to selectively couple the second flow controller to the mass flow verifier.
- In some embodiments, a method for calibrating a plurality of flow controllers in a substrate processing system comprising a first process chamber and a second process chamber coupled to a central vacuum transfer chamber is provided, In some embodiments, the method may include providing a first gas at a first flow rate from a first flow controller coupled to a first process chamber; diverting the first gas to a mass flow verifier via a first conduit; determining the first flow rate using the mass flow verifier; providing a second gas at a second flow rate from a second flow controller coupled to a second process chamber; diverting the second gas to the mass flow verifier via a second conduit; and determining the second flow rate using the mass flow verifier.
- In some embodiments, a method for calibrating a plurality of flow controllers in a substrate processing system is provided. In some embodiments, the method may include providing a first gas to a mass flow verifier by a first flow controller coupled to a first zone of a first process chamber; determining a first flow rate of the first gas using the mass flow verifier; providing a second gas to the mass flow verifier by a second flow controller coupled to a second zone of the first process chamber; and determining a second flow rate of the second gas using the mass flow verifier, wherein the first flow controller is capable of providing the first gas to the first zone while the second flow controller is providing the second gas to the mass flow verifier.
- Other and further embodiments of the present invention are described below.
- Embodiments of the present invention, briefly summarized above and discussed in greater detail below, can be understood by reference to the illustrative embodiments of the invention depicted in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
-
FIGS. 1-1A depict a schematic top view of a multi-chamber substrate processing system in accordance with some embodiments of the present invention. -
FIG. 2 depicts a flow chart of a method for calibrating a plurality of flow controllers in a substrate processing system in accordance with some embodiments of the present invention. -
FIG. 3 depicts a flow chart of a method for calibrating a plurality of flow controllers in a substrate processing system in accordance with some embodiments of the present invention. - To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. The figures are not drawn to scale and may be simplified for clarity. It is contemplated that elements and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
- Methods and apparatus for calibrating a plurality of flow controllers in a substrate processing system are disclosed herein. The inventive methods and apparatus advantageously facilitate measuring one or more flow rates provided by one or more flow controllers in direct comparison to both a reference standard (e.g., a mass flow verifier) and to other flow controllers coupled to one or more process chambers in various configurations. The inventive systems and methods thus may advantageously provide decreased time required to calibrate each of the flow controllers and improved uniformity between the flow controller measurements, thereby facilitating improved chamber matching (e.g., improved uniformity of process results between two different chambers operating under similar process conditions).
- Referring to
FIG. 1 , in some embodiments, a cluster tool, ormulti-chamber processing system 100 may generally comprise afactory interface 102, a vacuum-tight processing platform 104, and asystem controller 144. Examples of a processing system that may be suitably modified in accordance with the teachings provided herein include the Centura® integrated processing system, one of the PRODUCER® line of processing systems (such as the PRODUCER® GT™), ADVANTEDGE™ processing systems, or other suitable processing systems commercially available from Applied Materials, Inc., located in Santa Clara, California. It is contemplated that other processing systems (including those from other manufacturers) may be adapted to benefit from the invention. One example of a twin chamber processing system that may be modified to incorporate the present invention in accordance with the teachings herein is described in United States Provisional Patent Application Ser. No. 61/330,156, filed Apr. 30, 2010, by Ming Xu, et al., and entitled, “Twin Chamber Processing System.” - The
platform 104 may include a plurality of processing chambers (six shown) 110, 111, 112, 132, 128, 120 and at least one load-lock chamber (two shown) 122 that are coupled to atransfer chamber 136. Each process chamber includes a slit valve or other selectively sealable opening to selectively fluidly couple the respective inner volumes of the process chambers to the inner volume of thetransfer chamber 136. Similarly, eachload lock chamber 122 includes aport 125 to selectively fluidly couple the respective inner volumes of theload lock chambers 122 to the inner volume of thetransfer chamber 136. Thefactory interface 102 is coupled to thetransfer chamber 136 via theload lock chambers 122. - In some embodiments, for example, as depicted in
FIG. 1 , theprocessing chambers processing chambers chamber processing system - In addition, the twin chamber processing system further advantageously utilizes shared resources that facilitate reduced system footprint, hardware expense, utilities usage and cost, maintenance, and the like, while at the same time promoting higher substrate throughput. For example, as shown in
FIG. 1 , the process chambers may be configured such thatprocessing resources processing chambers twin processing system - In some embodiments, the
factory interface 102 includes at least onedocking station 108 and at least one factory interface robot (two shown) 114 to facilitate transfer of substrates. Thedocking station 108 is configured to accept one or more (two shown) front opening unified pods (FOUPs) 106A-B. In some embodiments, thefactory interface robot 114 generally comprises ablade 116 disposed on one end of therobot 114 configured to transfer the substrates from thefactory interface 102 to theprocessing platform 104 for processing through theload lock chambers 122. Optionally, one ormore metrology stations 118 may be connected to aterminal 126 of thefactory interface 102 to facilitate measurement of the substrates from theFOUPs 106A-B. - In some embodiments, each of the
load lock chambers 122 may include afirst port 123 coupled to thefactory interface 102 and asecond port 125 coupled to thetransfer chamber 136. Theload lock chambers 122 may be coupled to a pressure control system which pumps down and vents theload lock chambers 122 to facilitate passing the substrates between the vacuum environment of thetransfer chamber 136 and the substantially ambient (e.g., atmospheric) environment of thefactory interface 102. - In some embodiments, the
transfer chamber 136 has avacuum robot 130 disposed therein. Thevacuum robot 130 generally comprises one or more transfer blades (two shown) 134 coupled to amovable arm 131. In some embodiments, for example where theprocessing chambers FIG. 1 , thevacuum robot 130 may have twoparallel transfer blades 134 configured such that thevacuum robot 130 may simultaneously transfer twosubstrates load lock chambers 122 to each pair of processing chambers (e.g., 110 and 111, 112 and 132, and 120 and 128). - The
processing chambers - Each pair of
process chambers resources FIG. 1 for sharedresources - In some embodiments, the shared resources include a shared gas panel between process chambers. For example, the shared
resource 146B includes a sharedgas panel 150 that is shared between theprocess chamber 112 and theprocess chamber 132 as illustrated inFIG. 1 . The sharedgas panel 150 may, for example, include a plurality of process gas sources that are coupled to theprocess chambers gas panel 150 may be coupled to a mass flow controller that meters the gas from the gas source at a desired flow rate. For example, a first process gas from a first process gas source (not shown) of thegas panel 150 may be metered through aflow controller 152 and a second process gas from a second gas source (not shown) of the sharedgas panel 150 may be metered through aflow controller 154. The first and second process gases may exit theflow controllers mixer 156 which may be coupled to respective outlets of eachflow controller mixer 156 in a ratio relative to the respective amounts of each process gas metered out by theflow controllers - From an outlet of the
mixer 156, the mixed first and second process gases may be distributed to theprocess chambers flow ratio controller 158 may include a sharedinlet 160 for receiving the mixed first and second processes gases from the outlet of the mixer and may distribute the mixed first and second process gases to theprocess chambers FIG. 1 , two pairs offlow controllers process chamber 112 and a second pair of flow controllers (e.g., 166, 168) coupled to theprocess chamber 132. - The multi-channel
flow ratio controller 158, for example, may include one or more flow controllers each providing the mixed first and second process gas to eachprocess chamber 112, 132 (two flow controllers coupled to each chamber depicted inFIG. 1 ). For example, theflow controllers process chamber 112 and theflow controllers process chamber 132. Each pair of flow controllers, forexample flow controllers process chamber 112, at different flow rates. For example, theflow controller 162 may provide the mixed first and second process gas through afirst inlet 170 of theprocess chamber 112 at a different rate than provided by theflow controller 164 through asecond inlet 172 of theprocess chamber 112. For example, the first andsecond inlets - The multi-chamber
substrate processing system 100 further includes amass flow verifier 174 to verify a flow rate from each of the flow controllers discussed above and further any flow controller in need of flow rate verification in thesystem 100. For example, such additional flow controllers may be part of the sharedresource 146A or the sharedresource 146C. The sharedresources resource 146B. - The
mass flow verifier 174 may be any suitable apparatus for verifying the flow rate of a gas provided by a mass flow controller. Such mass flow verifiers may operate, for example, by monitoring the rate of rise of a pressure in a known volume over a period of time, or by some other suitable method for independently confirming the flow rate of any flow controller being monitored by themass flow verifier 174. In some embodiments, themass flow verifier 174 may be mounted on one of the twinchamber processing systems mass flow verifier 174 may be mounted on thetransfer chamber 136 of themulti-chamber processing system 100, or in some other suitable location for being coupled to each of the flow controllers coupled to each of the process chambers of themulti-chamber processing system 100. - The
mass flow verifier 174 may be selectively coupled to each flow controller by individual conduits disposed below (e.g., downstream of) an outlet of the flow controller. By selectively coupling each flow controller to the mass flow verifier via individual conduits, rather than by a single conduit coming from a manifold where the process gases are mixed together, the inventive apparatus facilitates independent verification and/or calibration of each flow controller without impacting the ability of the other flow controllers from providing process gases while verifying or calibrating the flow from one of the flow controllers. - Each conduit may be respectively coupled to a given flow controller at a location downstream of the flow controller by a multi-way valve (not shown), or the like, that may selectively couple a respective flow controller to either the process chamber or the
mass flow verifier 174. For example, when it is desired to verify a flow rate of a flow controller, a process gas that would normally flow from the outlet of a flow controller towards a process chamber may be diverted into the conduit by a multi-way valve to flow into themass flow verifier 174. During the verification period, the flow controller being verified does not provide a process gas to a process chamber, but all other flow controllers of thesystem 100 may continue to provide a process gas to a process chamber, for example to process a substrate or the like. In some embodiments, flow may be bypassed around themass flow verifier 174 so that the conduits can be quickly evacuated without having to flow through themass flow verifier 174, thereby speeding up gas switchover purging between different gas flows being verified. - For example, several conduits are illustrated in
FIG. 1 which couple respective flow controllers to themass flow verifier 174. Some conduits are omitted for the purpose of clarity inFIG. 1 . However, each flow controller of theprocess system 100 may have a conduit coupling the given flow controller to themass flow verifier 174. For example, aconduit 176 couples theflow controller 152 to themass flow verifier 174. A similar conduit (not shown) couples theflow controller 154 to themass flow verifier 174. Similarly,conduits mass flow verifier 174 torespective flow controllers adjacent process chamber conduit 180 couples theflow controller 166 to themass flow verifier 174 and aconduit 182 couples theflow controller 168 to themass flow verifier 174, where theflow controllers process chamber 132. - In some embodiments, all the conduits coupling the respective flow controllers of the
system 100 to themass flow verifier 174 may have substantially equivalent or about the same flow conductance. As used herein, substantially equivalent (or about the same) includes about +/−10 percent variation in conductance. Alternatively, and in some embodiments, the conduits coupling flow controllers providing process gases to corresponding regions in different process chambers (e.g., the first zone in each process chamber, the second zone in each process chamber, or the like) may have substantially similar or about the same flow conductance. For example, theconduits controllers adjacent process chambers flow controller mass flow verifier 174. Similarly, theconduit 176 coupling theflow controller 152 to themass flow verifier 174 and aconduit 184 coupling aflow controller 186 to the mass flow verifier may have substantially similar or about the same flow conductance. In the preceding example, theflow controller 186 is a flow controller that provides the same process gas to the twinchamber processing system 103 as theflow controller 152 provides to the twinchamber processing system 105. - Alternatively, or in combination with having all or pairs of conduits having substantially similar flow conductance, the
mass flow verifier 174 may be configured for choked flow where, for example, a flow rate of a process gas entering themass flow verifier 174 from a conduit is independent of the flow conductance in that conduit. For example, themass flow verifier 174 may further comprise acritical flow nozzle 188 disposed at an inlet of themass flow verifier 174 such that the process gas flows through the critical flow nozzle when entering themass flow verifier 174. Thecritical flow nozzle 188 may be configured, for example based on inlet and outlet hole diameter, length, shape or the like, to normalize a flow rate of any gas which enters thecritical flow nozzle 188 independent of the flow conductance in a conduit from which the gas originated. For example, the critical flow nozzle may provide a restriction such that a pressure drop across the critical flow nozzle is provided that at least halves the pressure (e.g., a first pressure immediately upstream of the critical flow nozzle is at least two times greater than a second pressure immediately downstream of the critical flow nozzle). Alternatively or in combination with having all or pairs of conduits having substantially similar flow conductance and/or themass flow verifier 174 being configured for choked flow, in some embodiments, the downstream conductance may be minimized to provide lower baseline pressures which enable higher flow rates to be used. - The
system controller 144 is coupled to theprocessing system 100 for controlling theprocessing system 100 or components thereof. For example, thesystem controller 144 may control the operation of thesystem 100 using a direct control of theprocess chambers system 100 or alternatively, by controlling the computers (or controllers) associated with theprocess chambers system 100. In operation, thesystem controller 144 enables data collection and feedback from the respective chambers andsystem controller 144 to optimize performance of thesystem 100. - The
system controller 144 generally includes a central processing unit (CPU) 138, amemory 140, and supportcircuits 142. TheCPU 138 may be one of any form of a general purpose computer processor that can be used in an industrial setting. The memory, or computer-readable medium, 140 is accessible by theCPU 138 and may be one or more of readily available memory such as random access memory (RAM), read only memory (ROM), floppy disk, hard disk, or any other form of digital storage, local or remote. Thesupport circuits 142 are conventionally coupled to theCPU 138 and may comprise cache, clock circuits, input/output subsystems, power supplies, and the like. The inventive methods disclosed herein may generally be stored in the memory 140 (or in memory of a particular process chamber pair, as discussed below) as a software routine that, when executed by theCPU 138, causes the pair of process chambers to perform processes in accordance with the present invention. -
FIG. 2 depicts a flow chart of amethod 200 for calibrating a plurality of flow controllers in a substrate processing system in accordance with some embodiments of the present invention. Themethod 200 will be described below in accordance with the inventive apparatus described inFIG. 1 . - At 202, a first gas may be provided by a first flow controller coupled to a first process chamber at a first flow rate to a mass flow verifier. For example, the first flow controller may be any flow controller of the
system 100 as described above, however, themethod 200 will be described below with respect to theflow controllers chamber process system 105. Accordingly, for the purposes of discussing themethod 200, the first flow controller may be theflow controller 166 which may provide a first gas to theprocess chamber 132 under typical operating conditions; however, during flow verification the first gas is diverted as discussed above through theconduit 180 to themass flow verifier 174. For example, during typical operating conditions, theflow controller 166 provides the first gas to the process chamber via afirst inlet 171, where thefirst inlet 171 is substantially equivalent to thefirst inlet 170 as discussed above forprocess chamber 112. - At 204, the first flow rate of the
flow controller 166 may be determine using themass flow verifier 174. For example, the first flow rate may be determined using rate of rise in a pressure in a known volume or a similar verification method. As discussed above, themass flow verifier 174 may be configured for choked flow or flow conductance of each conduit may be known or substantially similar. For example, if the first flow rate as determined by themass flow verifier 174 differed substantially from the first flow rate as read by theflow controller 166, theflow controller 166 may be calibrating based on the determined first flow rate by themass flow verifier 174. For example, in some embodiments, if a difference ranging from about 1% to about 5% between the determined first flow rate and the first flow rate as read by theflow controller 166 were to exist, theflow controller 166 may require calibration. For example, if the difference is less than about 1%, theflow controller 166 may be considered in condition for operation. If the difference is greater than about 5%, theflow controller 166 may require replacement. - At 206, the
mass flow verifier 174 may be cleared of the first gas after the first flow rate of theflow controller 166 is determined by themass flow verifier 174. For example, themass flow verifier 174 may be cleared of the first gas by diverting the first gas from theconduit 180 back to theprocess chamber 132 and/or turning off theflow controller 166. After the flow of the first gas through theconduit 180 has ceased, the first gas may be removed via an outlet (not shown) of themass flow verifier 174 by a vacuum pump or the like (not shown) coupled to or part of thesystem 100. - At 208, a second gas may be provided by a second flow controller coupled to a second process chamber at a second flow rate to the
mass flow verifier 174. For example, the second flow controller may be theflow controller 162 which may provide the second gas to theprocess chamber 112 under typical operating conditions; however, during flow verification the second gas is diverted as discussed above through theconduit 178 to themass flow verifier 174. In some embodiments, the second gas may be substantially equivalent to the first gas. In some embodiments, the second flow rate may be substantially equivalent to the first flow rate. In some embodiments, while the flow rate of theflow controller 162 is being verified by themass flow verifier 174, theflow controller 166 may be providing the first gas to theprocess chamber 132. In some embodiments, while the flow rate of theflow controller 162 is being verified, theflow controller 166 may be turned off. Similarly, theflow controller 162 may have been any one of providing the first gas to theprocess chamber 112 or turned off while theflow controller 166 was being verified at 202 and 204 as described above. - At 210, the second flow rate of the
flow controller 162 may be determine using themass flow verifier 174. For example, the second flow rate may be determined by any of the methods discussed above at 204. For example, in some embodiments, if a difference ranging from about 1% to about 5% between the determined second flow rate and the second flow rate as read by theflow controller 162 were to exist, theflow controller 162 may require calibration. For example, if the difference is less than about 1%, theflow controller 162 may be considered in condition for operation. If the difference is greater than about 5%, theflow controller 162 may require replacement. - Alternative to or in combination with the method steps 208-210, the
method 200 may proceed to 302 (as shown inFIG. 3 ) where the first gas provided by a third flow controller to the first process chamber at a third flow rate may be provided to themass flow verifier 174. For example, the third flow controller may be theflow controller 168 which provides the first gas to theprocess chamber 132 under typical operating conditions; however, during flow verification the first gas is diverted as discussed above through theconduit 182 to themass flow verifier 174. For example, during typical operating conditions, theflow controller 168 provides the first gas to the process chamber via asecond inlet 173, where thesecond inlet 173 is substantially equivalent to thesecond inlet 172 as discussed above forprocess chamber 112. For example, themethod 200 may proceed to 302 after the first gas has been cleared from themass flow verifier 174 at 206. Alternatively, themethod 200 may proceed to 302 after the second gas has been cleared from the mass flow verifier 174 (not illustrated in flow chart ofmethod 200 inFIG. 2-3 ) after theflow controller 162 has been verified at 210. - As discussed above, the
flow controllers flow ratio controller 158 which includes a sharedinlet 160 for receiving the first gas, which may for example be a mixture of process gases provided from the outlet of themixer 156, and may distribute the first gas (e.g., a singular gas or a mixture of gases) to theprocess chambers process chamber 132 via theflow controllers 166, 168). For example, theflow controllers process chamber 132 at a desired flow rate ratio between the first andsecond inlets flow controllers process chamber 132 via theflow controllers mass flow verifier 174. For example, as discussed above, theflow controller 166 has been verified at 204. - At 304, the third flow rate of the
flow controller 168 may be determine using themass flow verifier 174. For example, the third flow rate may be determined by any of the methods discussed above at 204. For example, in some embodiments, if a difference of about +/−5% between the determined third flow rate and the third flow rate as read by theflow controller 168 were to exist, theflow controller 168 may require calibration. - Similar to embodiments discussed above, either or both of the
flow controllers respective process chambers flow controller 168 is being verified as discussed below. For example, in some embodiments, the second gas can be provided to theprocess chamber 112 via the flow controller 162 (and/or via the flow controller 164) to process a substrate (not shown) disposed inprocess chamber 112 while theflow controller 168 is being verified by themass flow verifier 174. Further, theflow controller 166 may be idle or operating while theflow controller 168 is being verified by themass flow verifier 174. - Further, after determining the third flow rate at 304, the flow rate ratio of the first gas being provided to the
process chamber 132 via the first andsecond inlets flow controllers flow ratio controller 158 may be calibrated as a whole based on the determined flow rate ratio. - At 306, the
mass flow verifier 174 may be cleared of the first gas after determination of the third flow rate for theflow controller 168 is completed. For example, themass flow verifier 174 may be cleared using any of the methods discussed above. After themass flow verifier 174 is cleared of the first gas at 306, themethod 200 may, for example, proceed to step 208 or alternatively proceed to verify another flow controller, for example, such asflow controller 186 or other flow controllers associated with sharedresource 146C of twinchamber process system 103. Alternatively, if all flow controllers of thesystem 100 have been verified by themethod 200, themethod 200 may begin again, or be performed periodically, or after a desired number of process runs or the like to verify calibration of the flow controllers of thesystem 100. - Although described above in relation to a cluster tool configuration, the above teachings may also be used to modify a single process chamber having multiple zones in order to facilitate flow verification and calibration of multiple flow meters coupled to the various zones of the single process chamber. Alternatively or in combination, multiple process chambers that are proximately located may also be modified to share a mass flow verifier in accordance with the teachings provided herein. In some embodiments, a twin chamber processing system (e.g., 101) may be modified to share a mass flow verifier in accordance with the teachings provided herein without being mounted on a cluster tool.
- Thus, methods and apparatus for calibrating a plurality of flow controllers in a substrate processing system are disclosed herein. The inventive methods and apparatus advantageously facilitate measuring one or more flow rates provided by one or more flow controllers in direct comparison to both a reference standard (e.g., a mass flow verifier) and to other flow controllers coupled to one or more process chambers in various configurations. The inventive systems and methods thus may advantageously provide decreased time required to calibrate each of the flow controllers and improved uniformity between the flow controller measurements, thereby facilitating improved chamber matching (e.g., improved uniformity of process results between two different chambers operating under similar process conditions).
- While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof.
Claims (20)
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TW100112859A TWI483306B (en) | 2010-04-30 | 2011-04-13 | Methods and apparatus for calibrating flow controllers in substrate processing systems |
KR1020127019810A KR101451091B1 (en) | 2010-04-30 | 2011-04-25 | Methods and apparatus for calibrating flow controllers in substrate processing systems |
CN201180007645.2A CN103038867B (en) | 2010-04-30 | 2011-04-25 | For the device and method of calibrated fluxes controller in substrate processing system |
JP2013508127A JP5986988B2 (en) | 2010-04-30 | 2011-04-25 | Method and apparatus for calibrating a flow control device of a substrate processing system |
PCT/US2011/033780 WO2011137071A2 (en) | 2010-04-30 | 2011-04-25 | Methods and apparatus for calibrating flow controllers in substrate processing systems |
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JP5986988B2 (en) | 2016-09-06 |
CN103038867A (en) | 2013-04-10 |
US8707754B2 (en) | 2014-04-29 |
WO2011137071A3 (en) | 2012-03-01 |
KR20130025863A (en) | 2013-03-12 |
KR101451091B1 (en) | 2014-10-15 |
TWI483306B (en) | 2015-05-01 |
WO2011137071A2 (en) | 2011-11-03 |
TW201212121A (en) | 2012-03-16 |
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JP2013529381A (en) | 2013-07-18 |
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